While the word “waterbed” may trigger flashbacks to groovier times, the idea of sleeping on a water-filled mattress has never completely faded away. Waterbed enthusiasts still praise the bed’s ...

Whatever you do, don’t call it a waterbed. The Wavy Gravy-era fixture evokes a time when the free flow, water-filled mattresses were closely associated with shag carpet and bead curtains. These days, ...